Sheet-metal worker&#39;s hammer



Jan. 5, 1960 A. v. CREMENT SHEET-METAL WORKER'S HAMMER Filed 001;. 7,1957 Y mm E ma .W C Y W V. Y m,

I BY

United States P n O 2, 19, SHEET-METAL WORKERS HAMMER Anthony v Crement,Chicago, 111.

Application October 7, 1957, Serial No. 688,640

3 Claims. (Cl. 81-15) This invention relates in general to tools and inparticular to a sheet metal workers hammer.

In sheet metal work, particularly in the forming of ducts and similarstructures where Pittsburgh joints are used, it is highly desirable tofacilitate the completion of the Pittsburgh joints as it is a timeconsuming process since the joints must be well seated and the flangescompletely and neatly bent over and locked throughout their entirelength.

Various tools have been devised for this purpose but insofar as I amaware none of the tools in the prior art have the features of the tooldescribed and claimed hereinafter.

In the completion of a Pittsburgh jointthe first operation is to seatone flange well into a joint and the second operation is to bend thelocking flange completely over in a neat manner throughout its entirelength.

Although flat-sided hammers are known and can be used for certain ofthese operations, insofar as I am aware no hammer has been devised inwhich the handle has a special curve or configuration and is so relatedto the hammer head as to present one relation between the hammer headand the work when held in one position, and another relation between thehammer head and the Work when held in another position. Theserelationships are important for ease and rapidity in the locking of thePittsburgh joint as will be seen from the following.

The primary object of the invention, therefore, is to provide asheetmetal workers hammer with a head having substantially parallelfaces and a handle having an angular shank where it attaches to thehammer head, whereby the hand grip portion of the handle will beangularly related to the working faces of the hammer head.

It is another object of my invention to provide a sheetmetal workershammer in which the relationship of the hammer head to the handle issuch that the workers hand gripping the hammer handle cannot come incontact with the work regardless of the operation being performed in thelocking of a Pittsburgh joint.

And one more object of my invention is to form the hammer head andhandle of metal in one piece to give strength and permanency to thetool.

Other objects and advantages as well as the construction and manner ofuse of my invention will be apparent by reference to the followingspecification in connection with the accompanying drawing in which:

Fig. 1 is a side elevational view of my hammer when used in oneposition.

Fig. 2 is a similar view of the hammer turned 180 when used in anotherposition.

Fig. 3 is a fragmentary elevational view of the long face of the hammer.

Fig. 4 is an end view of the hammer head with its curved edges.

Fig. 5 is a fragmentary end view through a Pittsburgh joint with thehammer being used in one position to assemble the joint.

' in' another position to make the first bend of the locking PatentedJan. 5, 1960 Fig. 6 is a similar view with the hammer being used Fig. 7is a fragmentary isometric view of the joint and hammer again reversedand used to make the final bend gated as shown in Figs. 3 and 4. It isimportant that the sides 4-4' of the hammer head be substantiallyparallel to angular shank 2 of the handle and angularly related to thehandle 1. Edges 5 are curved as shown to prevent sharp denting of themetal when using the hammer. It is preferred that the handle and thehammer head be formed of metal in one piece, although a separate handlemay be used and suitably joined to the hammer head.

As will be seen in Fig. 5, when thet hammer is used to drive flange 6 ofsheet metal side 7 home into the reverse bend 8 on side 9, the side 4 ofsaid hammer is parallel to and adjacent side 7 and the handle 1, anglingas it does away from the hammer head keeps the operators hand well clearof the work and prevents denting of the sheet metal. If the handle wasnot curved as shown but was of conventional construction, the tendencywould be to angle the hammer head to keep from hitting ones hand andthis would most likely cause dent- .ing of the sheet metal,because thehammer head would not be parallel to the side 7.

After the flange 6 is well seated in the reverse bend 8 the next step isto bend locking flange 10 through an angle of and into contact with side7.

The best practice is to do this in two stages making the first bend atleast 45 or more. This is done by reversing the hammer so that side 4 isclosest to the work with shank 2 of the handle angling away from thework and the handle 1 parallel to but well spaced from side 7, so theoperators hand will be clear at the end of each stroke.

With the side 4 of the hammer head at an angle to the locking flange 10each stroke of the hammer will bend each portion of said flange atapproximately the same angle as the hammer travels along the flange asshown by dotted lines in Fig. 6.

In the next and final stage the hammer is again reversed 180 to placeface 4 of the hammer head adjacent locking flange 10 and substantiallyparallel to the side 7 with the handle 1 angling away from the work. Nowthe operator again travels the length of the locking flange and drivesit home against side 7 in a neat, eflicient and expeditious manner, withno danger of hitting his fingers on the work and making a uniformappearing bend with little or no wrinkles, creases or dents.

From the foregoing it will be seen that I have provided a new and simplearrangement in a sheetmetal workers hammer which will make it possiblefor him to perform the function of assembling and locking a Pittsburghjoint in a more expeditious and neater manner than was heretoforepossible with present'day tools.

Obviously, slight changes in form, proportion and details ofconstruction may be resorted to without departing from the spirit of myinvention and I reserve all rights to such changes as come within thescope of this specification and the claims which follow.

What I claim as new and desire to secure by Letters Patent is:

1. A sheetmetal workers hammer comprising a handle, an elongated hammerhead having its long dimension transversely disposed in relation to thehandle, a shank on the handle adjacent the hammer head and in alignmentwith two oppositely disposed elongated sides of said hammer head, theend portion of the handle being angularly disposed in one plane to theshank on said handle and to the oppositely disposed elongated sides ofsaid hammer.

2. The structure as specified in claim 1, the edges of the hammer headat the ends of the elongated sides being curved.

3. A sheet metal Workers hammer comprising a handle, an elongated hammerhead having its long dimension transversely disposed in relation to thehandle, pairs of oppositely disposed elongated sides on the hammer head,a shank on the handle adjacent the hammer head and in planar alignmentwith the tWo oppositely disposed elongated sides of said hammer head,the end portion of the handle extending from the sha posed to saidshank.

References Cited in the file of this patent UNITED STATES PATENTSVaughan Aug. 15,

Keyzer Oct. 10,

Haschart Oct. 30,

George May 5,

Zinke Mar. 27,

FOREIGN PATENTS Great Britain Nov. 11,

nk being angularly dis-

